Car-roof.



D. W. HAWKSWORTH,

GAR ROOF.

APPLICATION FILED AUG. 22, 1910.

Patented Mar. 2, 1915.

wam W THE mamas PETERS co., wunmcron, n. c.

UNITED STATES PATENT @FFTDE.

DAVID W. HAWKSWORTH, OF DETROIT, MICHIGAN, ASSIGNOR TO HU'ICHINS CAR ROOFING COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF IIIICHIGAN.

GAR-ROOF.

Specification of Letters Patent.

Patented Mar. 2, 1915.

Application filed August 22, 1910. Serial No. 578,303.

To all whom it may concern Be it known that 1, DAVID W. HAwKswonrn, a citizen of the United States of America, residing at Detroit, in the county of Vayne and State of Michigan, have in vented certain new and useful Improvements in Car-Roofs, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to car roofs of the type comprising carlines and intermediate roofing sheets, and it is the object of the invention to obtain a construction which will avoid the distortion or fracturing of the sheet due to weaving or torsional stresses in the car frame when in use.

The invention consists first, in the peculiar construction of a tapered carline and further in the peculiar construction, arrangement and combination of parts as hereinafter set forth.

In the drawings,Figure 1 is a plan view of a portion of a car roof provided with my improved construction; Fig. 2 is a section on line 00-50 Fig. 1.

A are the carlines and B the purlins constituting a roof frame of any suitable construction.

C are roofing sheets extending intermediate the carlines and supported upon the purlins, said sheets being provided with upstanding side flanges D. 4

E are the carline caps which embrace the carlines and the upstanding flanges D of the sheets and form the weather guards.

Heretofore, constructions of the type above described have been made with a clearance between the caps and the carlines so as to permit a lateral adjustment of the upstanding flanges of the roofing sheets. It has been found however, that in practical construction the parts are frequently assembled so that the clearance is only on one side of the sheet, the opposite side having its upstanding flange in close contact with the carline and the cap. Thus in use, the weaving stresses to which the car frame is sub jected will cause a buckling of the sheet frequently resulting in the rupturing of the same. To avoid the difficulty just noted I have substituted for the usual construction of carline having parallel sides, a construction of tapered carline. This will provide progressively increasing clearance from one end to the other of the sheet while the large end serves as a spacer to insure the proper assembling of the parts and to avoid the possibility of placing all of the clearance on one side only of the sheet. This construction is designed to have the sheet attached to the roof frame at the eaves while all other portions are free to move laterally to compensate for distortion in the roof framef As shown in Fig. l the carline A is tapered and sheets C are provided with upstanding flanges D that are parallel to each other on opposite edges of the sheet. Vith this construction the clearance is provided by reason of the fact that the tapering carlines will provide a greater space at the point farthest from the point of attachment for the sheets, than at said point of attachment. As shown, the carlines taper toward the ridge while the sheets are attached at the eaves. Thus, a progressively increasing clearance is provided from caves to ridge.

What I claim as my invention is:

1. In a car roof, the combination with carlines, of a roof sheet spanning the space between adjacent carlines and having upstanding flanges, said carlines being positioned intermediate the upstanding flanges of adjacent sheets and tapered from the cave to the ridge portions, for the purpose described.

2. In a car roof, the combination with relatively movable roofing sheets having upstanding side flanges, of carlines positioned intermediate the upstanding flanges of adjacent sheets, the portion of said carlines adjacent the upstanding flanges toward the eave portion being of greater width than the portion of the carlines adjacent the upstanding flanges toward the ridge portion.

In testimony whereof I aflix my signature in presence of two witnesses.

DAVID W. HATVKSW'ORTH.

Witnesses:

G. N. VVnsLnr, J. W. THOMPSON.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

